A201844 - OEIS

%I #5 Mar 31 2012 12:36:45

%S 1,411,17031,1566319,109797321,8964073263,697824874477,56238345975057,

%T 4510071758583443,365508148420971423,29684298137697156807,

%U 2422133463372341456079,198166150735435791683617

%N Number of zero-sum nX5 -1..1 arrays with every element equal to at least one horizontal or vertical neighbor

%C Column 5 of A201847

%H R. H. Hardin, <a href="/A201844/b201844.txt">Table of n, a(n) for n = 1..16</a>

%e Some solutions for n=3

%e ..1.-1..0..1.-1...-1..1..0..0..0...-1.-1.-1..1..0....0..1..1..1..0

%e ..1.-1..0..1.-1...-1..1.-1.-1..1...-1..0..1..1..0....0.-1.-1.-1..0

%e ..0..0..0..0..0....0..0.-1..1..1...-1..0..1..1..0....1..1.-1.-1..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 06 2011